"""
pipeline_service/work_env.py - 工作环境管理（沙箱的本地/远程切换 + 目录迁移）

工作环境以「用户 / 机构」为单位组织，缺省本地模式（bwrap 沙箱）。
远程模式 = 免密 SSH 到其他主机，远程主机同样部署 bwrap 走沙箱。

目录层级约定：项目目录位于「工作目录」（逻辑账号 deploy_dir）之下，
所以迁移只需同步工作目录顶层，即可覆盖所有项目内容。

- get_work_env: 查询用户/机构工作环境（user 优先 → org 兜底 → 缺省 local）
- set_work_env: 设置工作环境（切换 mode 时触发目录迁移）
- migrate_work_dir: 目录迁移（rsync 本地 deploy_dir ↔ 远程 remote_dir）
- run_remote_sandbox: 远程免密 SSH + bwrap 沙箱执行
"""

import os
import shlex
import shutil
import asyncio
import logging

logger = logging.getLogger("pipeline.work_env")

from .deploy_account import (
    BWRAP, deploy_dir_for, sanitize_username, account_name_for,
)

# rsync 可执行文件（迁移必需）
RSYNC = shutil.which("rsync")


def _row_to_env(row) -> dict:
    """DB 行 → 工作环境 dict。"""
    return {
        "mode": getattr(row, "mode", "local") or "local",
        "remote_host": getattr(row, "remote_host", "") or "",
        "remote_port": getattr(row, "remote_port", 22) or 22,
        "remote_user": getattr(row, "remote_user", "") or "",
        "remote_key_path": getattr(row, "remote_key_path", "") or "",
        "remote_dir": getattr(row, "remote_dir", "") or "",
    }


async def get_work_env(sor, user_id: str, org_id: str = "") -> dict:
    """获取工作环境。优先级：user 级 → org 级 → 缺省 local。"""
    if user_id:
        recs = await sor.sqlExe(
            "SELECT * FROM sd_work_envs WHERE owner_type='user' AND owner_id=${o}$ LIMIT 1",
            {"o": user_id})
        if recs:
            return _row_to_env(recs[0])
    if org_id:
        recs = await sor.sqlExe(
            "SELECT * FROM sd_work_envs WHERE owner_type='org' AND owner_id=${o}$ LIMIT 1",
            {"o": org_id})
        if recs:
            return _row_to_env(recs[0])
    return {"mode": "local", "remote_host": "", "remote_port": 22,
            "remote_user": "", "remote_key_path": "", "remote_dir": ""}


def _ssh_target(env: dict) -> str:
    """构造 scp/rsync 的 user@host 目标。"""
    user = env.get("remote_user", "")
    host = env.get("remote_host", "")
    if user:
        return f"{user}@{host}"
    return host


def _ssh_common_args(env: dict) -> list:
    """ssh/scp/rsync 共用的 SSH 参数。"""
    args = ["-o", "StrictHostKeyChecking=no", "-o", "ConnectTimeout=10"]
    key = env.get("remote_key_path", "")
    if key:
        args += ["-i", key]
    port = env.get("remote_port", 22) or 22
    args += ["-p", str(port)]
    return args


# ═══════════════════════════════════════════════════════════
# 目录迁移
# ═══════════════════════════════════════════════════════════

async def migrate_work_dir(account_name: str, from_mode: str, to_mode: str, env: dict) -> dict:
    """把工作目录内容从旧环境迁移到新环境。

    from_mode/to_mode ∈ {'local', 'remote'}
    - local → remote: rsync 本地 deploy_dir → remote_dir
    - remote → local: rsync remote_dir → 本地 deploy_dir
    """
    local_dir = deploy_dir_for(account_name)
    if to_mode == "local" and not os.path.isdir(local_dir):
        os.makedirs(local_dir, exist_ok=True)

    if not RSYNC:
        return {"ok": False, "error": "rsync 不可用，无法迁移"}

    # 构造 rsync 命令
    try:
        if from_mode == "local" and to_mode == "remote":
            # 本地 → 远程
            remote_dir = env.get("remote_dir", "")
            if not remote_dir:
                return {"ok": False, "error": "缺少远程目录 remote_dir"}
            target = _ssh_target(env) + ":" + remote_dir
            cmd = ["rsync", "-az", "--delete", "-e",
                   "ssh " + " ".join(_ssh_common_args(env)),
                   local_dir.rstrip("/") + "/", target.rstrip("/") + "/"]
        elif from_mode == "remote" and to_mode == "local":
            # 远程 → 本地
            remote_dir = env.get("remote_dir", "")
            if not remote_dir:
                return {"ok": False, "error": "缺少远程目录 remote_dir"}
            src = _ssh_target(env) + ":" + remote_dir
            cmd = ["rsync", "-az", "--delete", "-e",
                   "ssh " + " ".join(_ssh_common_args(env)),
                   src.rstrip("/") + "/", local_dir.rstrip("/") + "/"]
        else:
            # 同模式或无效，无需迁移
            return {"ok": True, "migrated": False}

        proc = await asyncio.create_subprocess_exec(
            *cmd, stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.PIPE)
        stdout, stderr = await asyncio.wait_for(proc.communicate(), timeout=300)
        if proc.returncode != 0:
            return {"ok": False, "error": "迁移失败: " + stderr.decode("utf-8", "replace")[-1000:]}
        return {"ok": True, "migrated": True,
                "detail": stdout.decode("utf-8", "replace")[-500:]}
    except asyncio.TimeoutError:
        return {"ok": False, "error": "迁移超时（300s）"}
    except Exception as e:
        return {"ok": False, "error": str(e)[:500]}


# ═══════════════════════════════════════════════════════════
# 设置工作环境
# ═══════════════════════════════════════════════════════════

async def set_work_env(sor, owner_type: str, owner_id: str, mode: str,
                       remote_config: dict = None, account_name: str = None) -> dict:
    """设置工作环境。切换 mode 时触发目录迁移。

    Returns: {"ok": bool, "mode": str, "migrated": {...}}
    """
    if owner_type not in ("user", "org"):
        return {"ok": False, "error": "owner_type 必须是 user 或 org"}
    if mode not in ("local", "remote"):
        return {"ok": False, "error": "mode 必须是 local 或 remote"}

    remote_config = remote_config or {}
    if mode == "remote":
        if not remote_config.get("remote_host"):
            return {"ok": False, "error": "远程模式需要 remote_host"}
        if not remote_config.get("remote_user"):
            return {"ok": False, "error": "远程模式需要 remote_user"}
        if not remote_config.get("remote_dir"):
            return {"ok": False, "error": "远程模式需要 remote_dir"}

    # 查旧环境（用于判断是否需要迁移）
    old_recs = await sor.sqlExe(
        "SELECT mode FROM sd_work_envs WHERE owner_type=${t}$ AND owner_id=${o}$ LIMIT 1",
        {"t": owner_type, "o": owner_id})
    old_mode = getattr(old_recs[0], "mode", "local") if old_recs else "local"

    # upsert
    from appPublic.uniqueID import getID
    data = {
        "owner_type": owner_type,
        "owner_id": owner_id,
        "mode": mode,
        "remote_host": remote_config.get("remote_host", ""),
        "remote_port": int(remote_config.get("remote_port", 22) or 22),
        "remote_user": remote_config.get("remote_user", ""),
        "remote_key_path": remote_config.get("remote_key_path", ""),
        "remote_dir": remote_config.get("remote_dir", ""),
    }
    if old_recs:
        await sor.sqlExe(
            "UPDATE sd_work_envs SET mode=${mode}$, remote_host=${h}$, remote_port=${p}$, "
            "remote_user=${u}$, remote_key_path=${k}$, remote_dir=${d}$ "
            "WHERE owner_type=${t}$ AND owner_id=${o}$",
            {"mode": mode, "h": data["remote_host"], "p": data["remote_port"],
             "u": data["remote_user"], "k": data["remote_key_path"],
             "d": data["remote_dir"], "t": owner_type, "o": owner_id})
    else:
        data["id"] = getID()
        await sor.C("sd_work_envs", data)

    # 触发迁移（模式切换 + 提供了 account_name 时）
    migrated = {"migrated": False}
    if account_name and old_mode != mode:
        env = _row_to_env_from_dict(data)
        migrated = await migrate_work_dir(account_name, old_mode, mode, env)

    return {"ok": True, "mode": mode, "old_mode": old_mode, "migration": migrated}


def _row_to_env_from_dict(data: dict) -> dict:
    return {
        "mode": data.get("mode", "local"),
        "remote_host": data.get("remote_host", ""),
        "remote_port": data.get("remote_port", 22),
        "remote_user": data.get("remote_user", ""),
        "remote_key_path": data.get("remote_key_path", ""),
        "remote_dir": data.get("remote_dir", ""),
    }


# ═══════════════════════════════════════════════════════════
# 远程沙箱执行
# ═══════════════════════════════════════════════════════════

def _remote_bwrap_cmd(env: dict, deploy_dir: str, command: str, workdir: str = "") -> list:
    """构造远程主机的 bwrap 沙箱命令（通过 SSH 执行）。"""
    # 远程主机上 bwrap 的路径（假设部署在 ~/bin/bwrap 或系统 PATH）
    remote_bwrap = "bwrap"
    parts = [
        remote_bwrap,
        "--unshare-user", "--unshare-pid", "--unshare-ipc", "--unshare-uts",
        "--die-with-parent",
        "--ro-bind", "/usr", "/usr",
        "--ro-bind", "/bin", "/bin",
        "--ro-bind", "/sbin", "/sbin",
        "--ro-bind", "/lib", "/lib",
        "--ro-bind", "/lib64", "/lib64",
        "--ro-bind", "/etc", "/etc",
        "--proc", "/proc",
        "--dev", "/dev",
        "--tmpfs", "/tmp",
        "--bind", deploy_dir, "/home",
        "--chdir", "/home",
        "--setenv", "HOME", "/home",
        "--", "bash", "-c", command,
    ]
    return parts


async def run_remote_sandbox(env: dict, deploy_dir: str, command: str,
                             workdir: str = "", timeout: int = 120) -> dict:
    """远程免密 SSH + bwrap 沙箱执行命令。"""
    ssh_args = _ssh_common_args(env)
    target = _ssh_target(env)

    bwrap_parts = _remote_bwrap_cmd(env, deploy_dir, command, workdir)
    inner = " ".join(shlex.quote(p) for p in bwrap_parts)

    ssh_cmd = ["ssh"] + ssh_args + [target, inner]

    try:
        proc = await asyncio.create_subprocess_exec(
            *ssh_cmd, stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.PIPE)
        stdout, stderr = await asyncio.wait_for(proc.communicate(), timeout=timeout + 30)
    except asyncio.TimeoutError:
        return {"rc": -1, "stdout": "", "stderr": f"远程命令超时（{timeout}s）", "sandbox": True, "remote": True}
    except Exception as e:
        return {"rc": -1, "stdout": "", "stderr": f"SSH 连接失败: {str(e)[:300]}", "sandbox": True, "remote": True}

    return {
        "rc": proc.returncode or 0,
        "stdout": stdout.decode("utf-8", "replace")[-8000:],
        "stderr": stderr.decode("utf-8", "replace")[-4000:],
        "sandbox": True,
        "remote": True,
    }


async def run_in_work_env(sor, account_name: str, user_id: str, org_id: str,
                          command: str, workdir: str = "", timeout: int = 120,
                          network: str = "shared") -> dict:
    """按工作环境 mode 分发执行：本地 bwrap 或远程 SSH+bwrap。"""
    env = await get_work_env(sor, user_id, org_id)
    if env.get("mode") == "remote":
        remote_dir = env.get("remote_dir", "")
        if not remote_dir:
            return {"rc": -1, "stdout": "", "stderr": "远程模式缺少 remote_dir",
                    "sandbox": True, "remote": True}
        return await run_remote_sandbox(env, remote_dir, command, workdir, timeout)
    from .deploy_account import run_in_sandbox
    return await run_in_sandbox(sor, account_name, command, workdir, timeout, network)


# ═══════════════════════════════════════════════════════════
# 远程 bwrap 部署（远程主机装 bwrap，零 root）
# ═══════════════════════════════════════════════════════════

async def ensure_remote_bwrap(env: dict) -> dict:
    """确保远程主机已安装 bwrap（零 root：apt download + dpkg -x）。"""
    ssh_args = _ssh_common_args(env)
    target = _ssh_target(env)

    script = (
        'mkdir -p ~/bin && '
        'if ! command -v bwrap >/dev/null 2>&1 && [ ! -x ~/bin/bwrap ]; then '
        'tmpd=$(mktemp -d) && (cd "$tmpd" && apt download bubblewrap >/dev/null 2>&1 '
        '&& dpkg -x bubblewrap*.deb . && cp usr/bin/bwrap ~/bin/bwrap) 2>/dev/null; '
        'rm -rf "$tmpd"; fi; '
        'if command -v bwrap >/dev/null 2>&1; then echo PATH_BWRAP; '
        'elif [ -x ~/bin/bwrap ]; then echo HOME_BWRAP; '
        'else echo NO_BWRAP; fi'
    )
    ssh_cmd = ["ssh"] + ssh_args + [target, script]
    try:
        proc = await asyncio.create_subprocess_exec(
            *ssh_cmd, stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.PIPE)
        stdout, stderr = await asyncio.wait_for(proc.communicate(), timeout=60)
        out = stdout.decode("utf-8", "replace").strip()
        if "NO_BWRAP" in out:
            return {"ok": False, "error": "远程主机无法获取 bwrap: " + stderr.decode("utf-8", "replace")[-300:]}
        return {"ok": True, "location": out.strip().splitlines()[-1] if out else "unknown"}
    except Exception as e:
        return {"ok": False, "error": str(e)[:300]}